tuple_size.hpp

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#ifndef STAN_MATH_PRIM_META_TUPLE_SIZE_HPP
#define STAN_MATH_PRIM_META_TUPLE_SIZE_HPP
 
#include <stan/math/prim/meta/is_tuple.hpp>
#include <type_traits>
#include <cstddef>
#include <tuple>
 
namespace stan {
 
template <typename T, typename = void>
struct tuple_size : std::integral_constant<std::size_t, 0> {};
 
template <typename T>
struct tuple_size<T, std::enable_if_t<stan::is_tuple_v<T>>>
    : std::integral_constant<std::size_t, std::tuple_size_v<std::decay_t<T>>> {
};
 
template <typename T>
constexpr std::size_t tuple_size_v = stan::tuple_size<T>::value;
}  // namespace stan
 
#endif